SDL/WhatsNew.txt

This is a list of major changes in SDL's version history.

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3.2.0:
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General:
* SDL headers should now be included as `#include <SDL3/SDL.h>`
* M_PI is no longer defined in SDL_stdinc.h, now the symbols SDL_PI_D (double) and SDL_PI_F (float) are available
* SDL_GetWindowWMInfo() returns a standard int result code instead of SDL_bool, and takes SDL_SYSWM_CURRENT_VERSION as a new third parameter
* The preprocessor symbol __MACOSX__ has been renamed __MACOS__
* The preprocessor symbol __IPHONEOS__ has been renamed __IOS__
* Removed the following functions from the API, see docs/README-migration.md for details:
    * SDL_CalculateGammaRamp()
    * SDL_GetRevisionNumber()
    * SDL_GetWindowBrightness()
    * SDL_GetWindowGammaRamp()
    * SDL_RWFromFP()
    * SDL_SetWindowBrightness()
    * SDL_SetWindowGammaRamp()
    * SDL_CreateRGBSurface()
    * SDL_CreateRGBSurfaceWithFormat()
    * SDL_CreateRGBSurfaceFrom()
    * SDL_CreateRGBSurfaceWithFormatFrom()
* Removed the following hints from the API, see docs/README-migration.md for details:
    * SDL_HINT_IDLE_TIMER_DISABLED
    * SDL_HINT_VIDEO_X11_FORCE_EGL
    * SDL_HINT_VIDEO_X11_XINERAMA
    * SDL_HINT_VIDEO_X11_XVIDMODE
* SDL_stdinc.h no longer includes stdio.h, stdlib.h, etc., it only provides the SDL C runtime functionality
* Added SDL_CreateSurface() and SDL_CreateSurfaceFrom() which replace the SDL_CreateRGBSurface*()
* Removed unused 'flags' parameter from SDL_ConvertSurface and SDL_ConvertSurfaceFormat